<template>
  <div>
    <el-row :gutter="20">
      <el-col :span="6">
        <el-input placeholder="输入关键字进行过滤" v-model="filterText"></el-input>
      </el-col>
      <el-col :span="4">
        <el-switch class="custom-tree-node1" v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"/>
      </el-col>
      <el-col :span="14" class="col-content-right">
        <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
        <el-button type="danger" @click="batchDelete">批量删除</el-button>
      </el-col>
    </el-row>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      :default-expanded-keys="expandedKey"
      node-key="catId"
      show-checkbox
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      :filter-node-method="filterNode"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
          <span>{{ node.label }}</span>
          <span>
            <el-button
              v-if = "node.level <= 2"
              type="text"
              size="mini"
              @click="() => append(data)">
              添加
            </el-button>
            <el-button
              type="text"
              size="mini"
              @click="() => edit(node, data)">
              修改
            </el-button>
            <el-button
              v-if = "node.childNodes.length == 0"
              type="text"
              size="mini"
              @click="() => remove(node, data)">
              删除
            </el-button>
          </span>
        </span>
    </el-tree>
    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false">
      <el-form :model="category">
        <el-form-item label="分类名称" :label-width="formLabelWidth">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="分类图标" :label-width="formLabelWidth">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位" :label-width="formLabelWidth">
          <el-input v-model="category.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      filterText: '',
      isHidden: false,
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      title: '',
      dialogType: '',
      category: {
        catId: null,
        name: '',
        parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        icon: '',
        productUnit: ''
      },
      menus: [],
      defaultProps: {
        children: 'children',
        label: 'name'
      },
      expandedKey: [],
      dialogVisible: false,
      dialogFormVisible: false,
      formLabelWidth: '120px'
    }
  },
  // 监控data中的数据变化
  watch: {
    filterText (val) {
      this.$refs.menuTree.filter(val)
    }
  },
  methods: {
    // 树节点过滤
    filterNode (value, data) {
      if (!value) return true
      return data.name.indexOf(value) !== -1
    },
    getMenus () {
      this.$http({
        url: this.$http.adornUrl('/product/category/list/tree'),
        method: 'get'
      }).then(({data}) => {
        // console.log('成功获取数据', data.data)
        this.menus = data.data
      })
    },
    // 添加分类
    append (data) {
      this.dialogVisible = true
      this.category = {
        catIdId: null,
        name: '',
        icon: '',
        productUnit: '',
        sort: 0,
        showStatus: 1
      }
      this.dialogType = 'add'
      this.title = '添加分类'
      this.category.parentCid = data.catId
      this.category.catLevel = data.catLevel * 1 + 1
    },
    // 修改分类
    edit (node, data) {
      this.dialogVisible = true
      this.dialogType = 'edit'
      this.title = '修改分类'
      // 发送请求获取当前节点最新数据
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: 'get'
      }).then(({ data }) => {
        this.category.name = data.data.name
        this.category.catId = data.data.catId
        this.category.icon = data.data.icon
        this.category.parentCid = data.data.parentCid
        this.category.productUnit = data.data.productUnit
      })
    },
    // 删除分类
    remove (node, data) {
      var ids = [data.catId]
      this.$confirm(`是否删除【${data.name}】菜单？`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        this.$http({
          url: this.$http.adornUrl('/product/category/delete'),
          method: 'post',
          data: this.$http.adornData(ids, false)
        }).then(({ data }) => {
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
          // 刷新界面
          this.getMenus()
          // 设置需要默认展开的菜单
          this.expandedKey = [node.parent.data.catId]
        })
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
    },
    // 添加分类
    addCategory () {
      var {name, parentCid, catLevel, showStatus, sort, icon, productUnit} = this.category
      this.$http({
        url: this.$http.adornUrl('/product/category/save'),
        method: 'post',
        data: this.$http.adornData({name, parentCid, catLevel, showStatus, sort, icon, productUnit}, false)
      }).then(({ data }) => {
        this.$message({
          type: 'success',
          message: '分类添加成功!'
        })
        this.dialogVisible = false
        // 刷新界面
        this.getMenus()
        // 设置需要默认展开的菜单
        // console.log('add:' + this.category.parentCid)
        this.expandedKey = [this.category.parentCid]
      })
    },
    // 修改分类
    editCategory () {
      var {catId, name, icon, productUnit} = this.category
      this.$http({
        url: this.$http.adornUrl('/product/category/update'),
        method: 'post',
        data: this.$http.adornData({catId, name, icon, productUnit}, false)
      }).then(({ data }) => {
        this.$message({
          type: 'success',
          message: '分类修改成功!'
        })
        this.dialogVisible = false
        // 刷新界面
        this.getMenus()
        // console.log('edit:' + this.category.parentCid)
        // 设置需要默认展开的菜单
        this.expandedKey = [this.category.parentCid]
      })
    },
    submitData () {
      if (this.dialogType === 'add') {
        this.addCategory()
      }
      if (this.dialogType === 'edit') {
        this.editCategory()
      }
    },
    // // 拖拽节点放置位置
    // allowDrop (draggingNode, dropNode, type) {
    //   // 1、被拖动的当前节点以及所在的父节点总层数不大于3
    //   // 被拖动的当前节点总层数
    //   console.log('allowDrop:', draggingNode, dropNode, type)
    //   this.countNodeLevel(draggingNode)
    //   // 当前正在拖动的节点+父节点所在的深度不大于3
    //   let deep = Math.abs(this.maxLevel - draggingNode.level) + 1
    //   console.log('深度：', deep)
    //   if (type === 'inner') {
    //     console.log(`this.maxLevel:${this.maxLevel};draggingNode.level:${draggingNode.level};dropNode.level:${dropNode.level}`)
    //     return (deep + dropNode.level) <= 3
    //   } else {
    //     return (deep + dropNode.parent.level) <= 3
    //   }
    // },
    // countNodeLevel (node) {
    //   // 找到所有子节点，求出最大深度
    //   if (node.childNodes != null && node.childNodes.length > 0) {
    //     for (let i = 0; i < node.childNodes.length; i++) {
    //       if (node.childNodes[i].level > this.maxLevel) {
    //         this.maxLevel = node.childNodes[i].level
    //       }
    //       this.countNodeLevel(node.childNodes[i])
    //     }
    //   }
    // },
    // 拖拽节点放置位置
    allowDrop (draggingNode, dropNode, type) {
      // console.log('allowDrop:', draggingNode, dropNode, type)
      // 重置 maxLevel
      this.maxLevel = draggingNode.level
      // 重新计算被拖动节点的最大深度
      this.countNodeLevel(draggingNode)
      // 计算当前深度
      const draggingDepth = Math.abs(this.maxLevel - draggingNode.level) + 1
      // console.log('深度：', draggingDepth)
      if (type === 'inner') {
        // 拖拽到目标节点内部
        // console.log(`this.maxLevel:${this.maxLevel}draggingNode.level:${draggingNode.level}dropNode.level:${dropNode.level}`)
        return (draggingDepth + dropNode.level) <= 3
      } else {
        // 拖拽到目标节点的前或后
        return (draggingDepth + dropNode.parent.level) <= 3
      }
    },
    countNodeLevel (node) {
      // 遍历所有子节点，计算出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          const childNode = node.childNodes[i]
          if (childNode.level > this.maxLevel) {
            this.maxLevel = childNode.level
          }
          this.countNodeLevel(childNode)
        }
      }
    },
    handleDrop (draggingNode, dropNode, dropType, ev) {
      // console.log('handleDrop: ', draggingNode, dropNode, dropType)
      // 1、当前节点最新的父节点id
      let pCid = 0
      let siblings = null
      if (dropType === 'before' || dropType === 'after') {
        pCid =
          dropNode.parent.data.catId === undefined ? 0 : dropNode.parent.data.catId
        siblings = dropNode.parent.childNodes
      } else {
        pCid = dropNode.data.catId
        siblings = dropNode.childNodes
      }
      this.pCid.push(pCid)

      // 2、当前拖拽节点的最新顺序，
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId === draggingNode.data.catId) {
          // 如果遍历的是当前正在拖拽的节点
          // this.updateNodes.push({catId: siblings[i].data.catId, sort: i, parentCid: pCid})
          let catLevel = draggingNode.level
          if (siblings[i].level !== draggingNode.level) {
            // 当前节点的层级发生变化
            catLevel = siblings[i].level
            // 修改他子节点的层级
            this.updateChildNodeLevel(siblings[i])
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel
          })
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i })
        }
      }
      // 3、当前拖拽节点的最新层级
      // console.log('updateNodes', this.updateNodes)
    },
    updateChildNodeLevel (node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level
          })
          this.updateChildNodeLevel(node.childNodes[i])
        }
      }
    },
    batchSave () {
      this.$http({
        url: this.$http.adornUrl('/product/category/update/sort'),
        method: 'post',
        data: this.$http.adornData(this.updateNodes, false)
      }).then(({ data }) => {
        this.$message({
          message: '菜单顺序等修改成功',
          type: 'success'
        })
        // 刷新出新的菜单
        this.getMenus()
        // 设置需要默认展开的菜单
        this.expandedKey = this.pCid
        this.updateNodes = []
        this.maxLevel = 0
      })
    },
    batchDelete () {
      let catIds = []
      let catNames = []
      let parentCids = []
      let checkedNodes = this.$refs.menuTree.getCheckedNodes()
      // console.log(checkedNodes)
      for (let i = 0; i < checkedNodes.length; i++) {
        catIds.push(checkedNodes[i].catId)
        catNames.push(checkedNodes[i].name)
        parentCids.push(checkedNodes[i].parentCid)
      }
      this.$confirm(`是否批量删除【${catNames}】菜单？`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        this.$http({
          url: this.$http.adornUrl('/product/category/delete'),
          method: 'post',
          data: this.$http.adornData(catIds, false)
        }).then(({ data }) => {
          this.$message({
            type: 'success',
            message: '菜单批量删除成功!'
          })
          // 刷新界面
          this.getMenus()
          // 设置需要默认展开的菜单
          this.expandedKey = parentCids
        })
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
    }
  },
  created () {
    this.getMenus()
  }
  // mounted () {
  //   const observer = new MutationObserver((mutations) => {
  //     mutations.forEach((mutation) => {
  //       if (mutation.type === 'attributes' && mutation.attributeName === 'aria-hidden') {
  //         const target = mutation.target
  //         if (target.getAttribute('aria-hidden') === 'true') {
  //           target.removeAttribute('aria-hidden')
  //           target.setAttribute('tabindex', '1')
  //         }
  //       }
  //     })
  //   })

  //   const treeElement = this.$refs.menuTree.$el
  //   observer.observe(treeElement, {
  //     attributes: true,
  //     subtree: true,
  //     attributeFilter: ['aria-hidden']
  //   })

  //   // Initial pass to fix existing elements
  //   const hiddenInputs = treeElement.querySelectorAll('input[aria-hidden="true"]')
  //   hiddenInputs.forEach(input => {
  //     input.removeAttribute('aria-hidden')
  //     input.setAttribute('tabindex', '1')
  //   })
  // }
}
</script>

<style>
  .custom-tree-node {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    padding-right: 8px;
  }
  .el-row {
    margin-left: 0px !important;
    line-height: 36px;
  }
  .col-content-right {
    text-align: right;
  }
</style>